Thumbnail-resolution too small, additional functionalities regarding thumbnails

[scarline]

Recently I downloaded a playlist on youtube and extracted the Audio. I used the following comandline:

youtube-dl -t --audio-format mp3 --audio-quality 0 --embed-thumbnail --add-metadata -x --metadata-from-title '%(artist)s - %(title)s' --ignore-errors https://www.youtube.com/playlist?list=PLIPoTusqlz4lqAeuWjibZgaJ1VItumklt

The thumbnails are embedded correctly, but the resolution is too small. It stays behind the max resolution of the video. In fact, they are downloaded full-size as jpg, but they are not embedded as such in the mp3. This results in pixel-like covers. From my point of view it would be a cool idea to implement a setting for choosing the resolution with an option for a max. in quality. Additionally (this refers not directly to the issues) a functionality to link a music track with the official single or audio-cover with extracted meta-data would be perfect.

LOG:

[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'-t', u'--audio-format', u'best', u'--audio-quality', u'0', u'--embed-thumbnail', u'--add-metadata', u'-x', u'--metadata-from-title', u'%(artist)s - %(title)s', u'--ignore-errors', u'https://www.youtube.com/playlist?list=PLIPoTusqlz4lqAeuWjibZgaJ1VItumklt']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.04.24
[debug] Python version 2.7.10 - Linux-4.2.0-35-generic-x86_64-with-Ubuntu-15.10-wily
[debug] exe versions: avconv 2.7.6-0ubuntu0.15.10.1, avprobe 2.7.6-0ubuntu0.15.10.1, ffmpeg 2.7.6-0ubuntu0.15.10.1, ffprobe 2.7.6-0ubuntu0.15.10.1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube:playlist] PLIPoTusqlz4lqAeuWjibZgaJ1VItumklt: Downloading webpage
|DNS-request| www.youtube.com

• I've verified and I assure that I'm running youtube-dl 2016.04.24
• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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[dstftw]

Thumbnails are embedded intact with exactly same resolution they have on web.